Enable CentOS 32-bit support for memory larger than 4 GB

When a CentOS5.6 machine needs to upgrade the memory to 6 GB, the system is found to be 32-bit, so the search can enable the 32-bit system to support 4 GB memory or above. How does one make linux/Centos32-bit support 8 GB memory? The kernel-based PAE installation supports a method larger than 4 GB memory. Linux/Centos32bitOS does not support 4 GB memory or above by default. you can install a kernel-PAE patch to solve this problem. you 'd better back up a snapshot of the virtual machine before the operation to avoid unexpected recovery.

When a CentOS 5.6 machine needs to upgrade the memory to 6 GB, the system is found to be 32-bit, so the search can enable the 32-bit system to support 4 GB memory or above.

How does one enable 32-bit linux/Centos to support 8 GB memory? The kernel-based PAE installation supports a method larger than 4 GB memory. Linux/Centos 32bit OS does not support 4 GB memory or above by default. you can install a kernel-PAE patch to solve this problem. it is best to back up a snapshot of the virtual machine before the operation, in case of an accident, it can be restored to normal.

The following are the steps:

[Root@www.ctohome.com] # freetotal used freeshared buffers cachedMem: 3881968 637928 3244040 0 111292 461680-/+ buffers/cache: 64956 3817012 Swap: 4192924 0 4192924 [root@www.ctohome.com] # yum install kernel-PAELoaded plugins: fastestmirrorLoading mirror speeds from cached hostfilecentos-burstnet | 1.1 kB updates-burstnet | 1.9 kB Setting up Install ProcessResolving Dependencies --> Running Transaction check ---> Package kernel-PAE.i686 0: 2. 6.18-194.32.1.el5 setto be installed --> Finished Dependency ResolutionDependencies Resolved ==================== ========================================================== ========================================================== ========================================================== ========================== Package Arch Version Repository Size ======== ======================================================== ========================================================== ========================================================== ========================================================== =========== Installing: kernel-PAE i686 2.6.18-194.32.1.el5 updates-burstnet 17 MTransaction Summary ================== ========================================================== ========================================================== ========================================================== ====================================== Install 1 Package (s) Upgrade 0 Package (s) Total download size: 17 MIs this OK [y/N]: yDownloading Packages: kernel-PAE-2.6.18-194.32.1.el5.i686.rpm | 17 MB 00:01 Running rpm_check_debugRunning Transaction TestFinished Transaction TestTransaction Test SucceededRunning TransactionInstalling: kernel-PAE 1/1 Installed: kernel-PAE.i686 0: 2. 6.18-194.32.1.el5 Complete! [Root@www.ctohome.com] # freetotal used freeshared buffers cachedMem: 3881968 637928 3244040 0 111292 461680-/+ buffers/cache: 64956 3817012 Swap: 4192924 0 4192924 [root@www.ctohome.com] # vi/boot/grub. confdefault = 0 # (change default = 1 to default = 0) timeout = 5 splashimage = (hd0, 0)/grub/splash.xpm.gz hiddenmenutitle CentOS (2.6.18-194.32.1.el5PAE) # (with this line of PAE, it indicates that the pae kernel is successfully installed) root (hd0, 0) kernel/vmlinuz-2.6.18-194.32. 1. el5PAE ro root = LABEL =/initrd/initrd-2.6.18-194.32.1.el5PAE.imgtitle CentOS (2.6.18-194.32.1.el5) root (hd0, 0) kernel/vmlinuz-2.6.18-194.32.1.el5 ro root = LABEL =/initrd/initrd-2.6.18-194.32.1.el5.imgtitle CentOS (2.6.18-194. el5) root (hd0, 0) kernel/vmlinuz-2.6.18-194.el5 ro root = LABEL =/initrd/initrd-2.6.18-194.el5.img [root@www.ctohome.com] # reboot (restart the server here, pray, sometimes the motherboard or Nic is not supported, then you can only contact the data center.) Broadcast me Ssage from root (pts/0) (Thu May 19 18:52:34 2011): The system is going down forreboot NOW! [Root@www.ctohome.com] # freetotal used freeshared buffers cachedMem: 8295488 215248 8080240 0 19460 142592-/+ buffers/cache: 53196 8242292 4192924 Swap: 4192924 0

The upgrade is complete and supports large memory.